[vala] Fix build with -Werror=enum-compare

[Rico Tzschichholz <ricotz src gnome org>]

commit 57b711e2a0d41536245d7e3a8ccae71a72ba387e
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Nov 12 00:34:00 2016 +0100

    Fix build with -Werror=enum-compare

 gobject-introspection/gidl.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gobject-introspection/gidl.vapi b/gobject-introspection/gidl.vapi
index aaa8d76..98b155c 100644
--- a/gobject-introspection/gidl.vapi
+++ b/gobject-introspection/gidl.vapi
@@ -249,7 +249,7 @@ namespace GLib {
                public string[] errors;
        }
 
-       [CCode (cname = "GITypeTag", cprefix = "TYPE_TAG_", cheader_filename = "gmetadata.h")]
+       [CCode (cname = "TypeTag", cprefix = "TYPE_TAG_", cheader_filename = "gmetadata.h")]
        public enum TypeTag
        {
                VOID,